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Which of the following salts will give highest pH in water?

1. KCl
2. NaCl
3. Na2CO3
4. CuSO4

Correct answer: Na2CO3

Solution

Na2CO3 is a salt of a strong base (NaOH) and a weak acid (H2CO3), making its aqueous solution basic and resulting in the highest pH among the options.

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